122 lines
4.3 KiB
Mathematica
122 lines
4.3 KiB
Mathematica
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function [txPad,cfgHE]=TX_SU(cfgHE,txPSDU)
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if isfield(cfgHE,'InterleavLen')
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tx = SU_Special(cfgHE,txPSDU);
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% Add trailing zeros to allow for channel delay
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txPad = [tx; zeros(30,1)];
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else
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% psduLength = getPSDULength(cfgHE); % PSDU length in bytes
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% txPSDUcrc = TX_CRC32(txPSDU(1:(psduLength*8 - 32)));
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txPSDUcrc = txPSDU;
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tx = wlanWaveformGenerator(txPSDUcrc,cfgHE);
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% Add trailing zeros to allow for channel delay
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txPad = [tx; zeros(30,cfgHE.NumTransmitAntennas)];
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end
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end
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function crcData = TX_CRC32(dataPacketBits)
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poly = [32,26,23,22,16,12,11,10,8,7,5,4,2,1,0];
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crcGen32 = comm.CRCGenerator(...
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'Polynomial', poly, ...
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'InitialConditions', 1, ... % Initial states of the internal shift register 移位寄存器
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'DirectMethod', true, ...
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'FinalXOR', 1); % 打开 XOR操作
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crcData = crcGen32(dataPacketBits);
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end
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%%
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function tx = SU_Special(WaveformPara,txPSDU)
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% tx_STF = STS_modulation(NumerologyNo); % STF
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scrData = TX_CRC32_Scramble(txPSDU);
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trellis = poly2trellis(7,[171 133]);
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tx_encoded_bit = convenc(scrData,trellis,WaveformPara.puncpat);
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tx_padded_bit = [tx_encoded_bit;zeros(WaveformPara.DataPadding,1)];
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%---------------------------------------------
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dataMod = qammod(tx_padded_bit,WaveformPara.Mod,'InputType','bit','UnitAveragePower',true);
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WaveformPara.Power_sym = mean(abs(dataMod).^2);
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dataMod = reshape(dataMod,WaveformPara.UsedSubcarrier,[]);
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% 获取信道响应 %假设已知前一时刻的信号
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% 生成信道响应
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% N_carriers = WaveformPara.N_FFT;
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% rng(2);
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% channel_response=sqrt(1/2)*(randn(1,N_carriers)+1i*randn(1,N_carriers));
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% % 窗的数目
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% N_windows = 8;
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% % 定义量化水平总数
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% N_level = 10;
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% % 最小CP值，外部条件，取决于最大延迟拓展，有最小CP值>最大延迟拓展
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% min_len_CP = 30;
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% % 测试函数
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% CPset = Generate_CP(channel_response,N_windows,N_level,min_len_CP);
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% 物理层加密
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% [serialOFDMsym,WaveformPara.pilot,myFrameLen] = tx_FFTSymbolGen_PilotBlockPN(dataMod,WaveformPara,CPset); % 加CP的地方
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[serialOFDMsym,WaveformPara.pilot] = tx_FFTSymbolGen_PilotBlockPN(dataMod,WaveformPara);
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WaveformPara.Power_sig = mean(abs(serialOFDMsym).^2);
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txdata = serialOFDMsym/sqrt(WaveformPara.Power_sig);
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cfg = wlanNonHTConfig('SignalChannelBandwidth',true, ...
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'BandwidthOperation','Static');
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cfg.MCS = WaveformPara.MCS;
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cfg.PSDULength = WaveformPara.PacketSize; %0-4095
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% tx_STF = STS_modulation(NumerologyNo); % STF
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FrameNo = WaveformPara.NumerologyNo;
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tx_STF = wlanLSTF(cfg); % STF
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tx_LTF = wlanLLTF(cfg); % LTF
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[tx_SIG, tx_sigdata] = newLSIG(cfg,FrameNo);% SIG
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tx = [tx_STF;tx_LTF;tx_SIG;serialOFDMsym;zeros(30,1)];
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end
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function [serialOFDMsym,pilot] = tx_FFTSymbolGen_PilotBlockPN(dataModInMatrix,WaveformPara,SysParameters)
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numOfdmSymbol = WaveformPara.FrameSymNum;
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N_used = WaveformPara.UsedSubcarrier;
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CP_Len = WaveformPara.CP_Len;
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pnSequence = comm.PNSequence('Polynomial',[8 6 5 4 0], ...
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'SamplesPerFrame',N_used,'InitialConditions',[0 0 0 0 0 0 0 1]);
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% pilotPower = WaveformPara.Power_sym;
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% pilot = generatePilot(pnSequence,pilotPower);
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pilot = generatePilot(pnSequence,1);
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m = WaveformPara.PilotNum-1;
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dataModAddPilot = zeros(N_used,numOfdmSymbol);
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for i = 1:m
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dataModAddPilot(:,(i-1)*(WaveformPara.PilotInterval+1)+1:i*(WaveformPara.PilotInterval+1)) = ...
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[pilot,dataModInMatrix(:,(i-1)*WaveformPara.PilotInterval+1:i*WaveformPara.PilotInterval)];
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end
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dataModAddPilot(:,m*(WaveformPara.PilotInterval+1)+1:end) = ...
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[pilot,dataModInMatrix(:,m*WaveformPara.PilotInterval+1:end)];
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dataModAddPilot_shift = [zeros(1,WaveformPara.FrameSymNum);...
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dataModAddPilot(1:(N_used-1)/2,:);...
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zeros(WaveformPara.NullSubcarrier,WaveformPara.FrameSymNum);...
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dataModAddPilot(1+(N_used-1)/2:end,:)];
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OFDMsym = ifft(dataModAddPilot_shift,[],1)*sqrt(WaveformPara.N_FFT)/sqrt(N_used)*sqrt(WaveformPara.N_FFT);
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OFDMsymAddCP = [OFDMsym(WaveformPara.N_FFT-CP_Len+1:end,:);OFDMsym];
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serialOFDMsym = reshape(OFDMsymAddCP,[],1);
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end
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function pilot = generatePilot(pnSequence,Power)
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pilot = pnSequence();
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bpskModulator = comm.BPSKModulator;
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pilot = bpskModulator(pilot)*sqrt(Power);
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end
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